Finding the Fourth Proportional to 31,005.08, 42,788.76 and 16,857.62

Step by Step Solution

1. Step 1: Write the proportion equation
   31,005.08 : 42,788.76 = 16,857.62 : x
2. Step 2: Convert to fraction form
   31,005.08/42,788.76 = 16,857.62/x
3. Step 3: Cross multiply
   31,005.08x = 42,788.76 × 16,857.62
4. Step 4: Simplify right side
   31,005.08x = 721,316,656.35
5. Step 5: Solve for x
   x = 721,316,656.35/31,005.08
6. Step 6: Final answer
   x = 23,264.47